hanray



(No Model.)

J. B. HANNAY.

INGRUSTATION PREVENTIVE.

Patented Sept. 25,1883.

. suddenly. Thus a convenient and satisfactory UNITED STATES PATENTOFFICE.

J AMES B. vHANNAY, OF GLASGOW, COUNTY OF LANARK, SCOTLAND.

INCRUSTATlON-PREVENTIYE.

SPECIFICATION forming part of. Letters Patent No. 285,615, datedSeptember 25, 1883,

Application filed April 9, 1883. (No model.) Patented in England June11, 1881, No. 2,544; in France December 15, 1882, No. 152,645, and inItaly December 18, 1882, No. 14,907.

To aZZ whom it may concern.-

Be it known that 1, JAMES BALLANTYNE HANNAY, a subject of the Queen ofGreat Britain and Ireland, and residingat Glasgow,

county of Lanark, Scotland, have invented certain Improvements inApplying Zinc for Preventing Corrosion in Steam-Boilers, (for which Ihave obtained the following patents: Great Britain, dated June 11, 1881,No. 2,544; France, dated December 15, 1882, No. 152,645; Italy, datedDecember 18, 1882, No. 14,907,) of which the following is aspecification.

Vhen zinc is used in steam-boilers as an anti-corrosive agent, itbecomes itself corroded through its mass, and when employed in the formof plates or other comparatively thin extended form itrapidlydisintegrates and por' tions become detached from the main body.I believe that the maintenance of a proper and sufficient metallicconnection between the zinc and the shell or other part of the boiler isessential, or at any rate of great importance, for the obtainment of thedesired anti-corrosive or protective action; and to secure this resultthe zinc is by my invention applied in blocks or masses which are of aspherical or spheroidal or polyhedral or cubical form or other formhaving but small difference of thickness in dif ferent directions,preference being given to the simple spherical form. Each sphere orblock is by preference three inches, or more, in diameter, and has awire metallically united to it, so as to extend to or beyond its center,the union being effected by casting the block upon the wire, or in someother sufficient manner. The wire,whieh may be of copper or of othersuitable metal or alloy which is a good conductorof electricity, has itsother end attached, by soldering or brazing or other equiv alent means,to the shell or tubes or other part of the boiler which it is wished toprotect from corrosion. The spheres or blocks are placed in the water inthe boiler in any convenient situation, and are suspended or supportedin any convenient way, but by preference not by means of theconducting-wires. The blocks or masses of zinc are cast; but in order torender them more durable and efficient they are subsequently broughtinto the condition known as malleable. For this purpose the masses arehammered or forcibly pressed or rolled, the operation being bypreference effected means for the purpose consists of a powerfulscrew-press fitted with a heavyfly-wheelor heavily-weighted arms andprovided with suitably-shaped dies. The blocks or masses are bypreference submitted to the hammering or compressing operation whenheated to a temperature between 120 and 160 centigrade. By a furtherimprovement the zinc is made more susceptible of being renderedmalleable by being alloyed with a small portionsay not more than ten percentum-of lead, tin, or copper.

Figures 1 and 2 on the accompanying sheet of drawings are front and sideelevations of a spherical block of zinc as suspended in a boiler, andFig. 3 is a horizontal section.

In these drawings the same reference-numerals are used to mark the sameor like parts wherever they are repeated.

The sphere or ball 4., of zinc, is cast upon a brass core, 5, formed, bypreference, as shown, with projections 6 radiating from the center. Toone end of this core 5 there is soldered or brazed a copper wire, 7, theother end of which is soldered to the shell of the boiler. The ball 4 issuspended by means of an iron strap, 8, from one of the boiler-stays,.9, the ball being held or clipped between the lower ends of the strap 8by means of screw-bolts 10, and by means of cross-pieces 11, riveted tothe strap ends. Another very convenient mode of holding the zinc ballisshown in Fig. 4. According to this modification the ball 1 is simplyplaced in a ladle, 12, having a handle, 13, which is attached to some ofthe tubes 14 of the boiler by a clamping-bar, 15, and screwbolts.

I claim as my invention The combination of the shell of a steamboilerand zinc blocks of a spherical or other J. B. HANNAY.

Witnesses:

EDMUND HUNT,

D. Fnneuson.

